Q400 Systems Test Bank Questions With Complete
Solutions
100. Which batteries are used for engine starting when ground
power is not available? Correct Answers Main/Aux
101. How long will the batteries power the aircraft if normal
electrical power fails? Correct Answers At Least 60 minutes
Some models do 45 minutes or 60 minutes
102. How many battery switches are there? Correct Answers 4
Switches. - MASTER. MAIN. AUX. STBY
103. True or False: If the battery master is in the OFF position,
the other batteries can still be used to power the aircraft. Correct
Answers FALSE. (Think MASTER)
104. True or False: When the battery master is in the OFF
position, all battery power is turned off no matter what position
the other switches are in. Correct Answers TRUE
105. If the battery is being charged at a 100% rate of charge,
how will it be depicted on the MFD Battery page? Correct
Answers 1.00
106. How is negative discharge on a battery indicated on the
MFD Battery page? Correct Answers - minus sign (-)
107. When the battery temperature is within limits, what color
does it display as on the MFD Electrical page? Correct Answers
White
,108. When the battery temperature exceeds normal limits, what
colors would display on the MFD Electrical page? Correct
Answers Yellow or Red
109. If any battery temperature is 50 degrees C to 60 degrees C,
what color does the battery temperature display as on the MFD
Battery page? Correct Answers Yellow
110. Where can the GPU be connected to the aircraft for DC
power? Correct Answers Plug on the left forward fuselage
111. When connected to external power on the ground, what is
displayed on the MFD Electrical page? Correct Answers DC
EXT PWR ON (in green)
112. True or False: The EPCU protects the system from too high
and too low DC power voltage form the external power source.
Correct Answers True
113. After engine start, how many volts does the DC generator
provide? Correct Answers 28 V DC Current
114. Where are the Transformer Rectifier Units (TRUs) located?
Correct Answers In The nose
115. TRUs change 3-phase 115v AC to what? Correct Answers
28 v DC Output
116. During normal operation, which busses do the TRUs
power? Correct Answers L or R Secondary Bus
,117. A L TRU caution light will illuminate when what happens?
Correct Answers If the Respective TRU is offline or has failed.
118. On the ground, what busses does the APU generator
provide power for? Correct Answers All six busses
119. What does it mean when a plus sign (+) is displayed in
front of a value on the MFD Electrical page? Correct Answers
Overload of power source
120. The entire electrical system can still be powered when up to
how many power sources have failed? Correct Answers 2
121. When does the EPCU send a signal to the generator to trip
it offline during a Main DC bus fault? Correct Answers After .5
seconds or more
122. If the Right Main Bus has a bus fault, which battery is
disconnected from the system? Correct Answers Main Batt
123. True or False: If a Secondary bus fault occurs, the
increased current will trip the circuit breaker for the respective
TRU. Correct Answers TRUE
124. In addition to an inoperative TRU, what is required for the
EPCU to enter emergency mode? Correct Answers Airplane in
air — Both DC gens are not available
, 125. In addition to a dual DC Generator failure, what is required
for the EPCU to enter emergency mode? Correct Answers
INOP TRU and Airplane in Air
126. True or False: In emergency mode, the batteries are the
main source of power. Correct Answers TRUE
127. When in emergency mode, which busses automatically
disconnect from the batteries? Correct Answers Main Bus
128. What is the voltage output of the AC generators? Correct
Answers 115 V
129. Where are the AC generators mounted on the aircraft?
Correct Answers Propeller reduction gearbox
130. How many external AC power ports are there on the
aircraft? Correct Answers 1
131. When the aircraft is powered by external DC power, which
busses are powered? Correct Answers L/R main feeder buses,
Essential Buses, and feeder busses
132. True or False: When a DC generator fails, the Main Bus
Tie switch must be manually selected. Correct Answers
133. Which switch would pilots use to connect the main battery
to the associated feeder bus? Correct Answers Main Battery
switch in the DC control Panel
Solutions
100. Which batteries are used for engine starting when ground
power is not available? Correct Answers Main/Aux
101. How long will the batteries power the aircraft if normal
electrical power fails? Correct Answers At Least 60 minutes
Some models do 45 minutes or 60 minutes
102. How many battery switches are there? Correct Answers 4
Switches. - MASTER. MAIN. AUX. STBY
103. True or False: If the battery master is in the OFF position,
the other batteries can still be used to power the aircraft. Correct
Answers FALSE. (Think MASTER)
104. True or False: When the battery master is in the OFF
position, all battery power is turned off no matter what position
the other switches are in. Correct Answers TRUE
105. If the battery is being charged at a 100% rate of charge,
how will it be depicted on the MFD Battery page? Correct
Answers 1.00
106. How is negative discharge on a battery indicated on the
MFD Battery page? Correct Answers - minus sign (-)
107. When the battery temperature is within limits, what color
does it display as on the MFD Electrical page? Correct Answers
White
,108. When the battery temperature exceeds normal limits, what
colors would display on the MFD Electrical page? Correct
Answers Yellow or Red
109. If any battery temperature is 50 degrees C to 60 degrees C,
what color does the battery temperature display as on the MFD
Battery page? Correct Answers Yellow
110. Where can the GPU be connected to the aircraft for DC
power? Correct Answers Plug on the left forward fuselage
111. When connected to external power on the ground, what is
displayed on the MFD Electrical page? Correct Answers DC
EXT PWR ON (in green)
112. True or False: The EPCU protects the system from too high
and too low DC power voltage form the external power source.
Correct Answers True
113. After engine start, how many volts does the DC generator
provide? Correct Answers 28 V DC Current
114. Where are the Transformer Rectifier Units (TRUs) located?
Correct Answers In The nose
115. TRUs change 3-phase 115v AC to what? Correct Answers
28 v DC Output
116. During normal operation, which busses do the TRUs
power? Correct Answers L or R Secondary Bus
,117. A L TRU caution light will illuminate when what happens?
Correct Answers If the Respective TRU is offline or has failed.
118. On the ground, what busses does the APU generator
provide power for? Correct Answers All six busses
119. What does it mean when a plus sign (+) is displayed in
front of a value on the MFD Electrical page? Correct Answers
Overload of power source
120. The entire electrical system can still be powered when up to
how many power sources have failed? Correct Answers 2
121. When does the EPCU send a signal to the generator to trip
it offline during a Main DC bus fault? Correct Answers After .5
seconds or more
122. If the Right Main Bus has a bus fault, which battery is
disconnected from the system? Correct Answers Main Batt
123. True or False: If a Secondary bus fault occurs, the
increased current will trip the circuit breaker for the respective
TRU. Correct Answers TRUE
124. In addition to an inoperative TRU, what is required for the
EPCU to enter emergency mode? Correct Answers Airplane in
air — Both DC gens are not available
, 125. In addition to a dual DC Generator failure, what is required
for the EPCU to enter emergency mode? Correct Answers
INOP TRU and Airplane in Air
126. True or False: In emergency mode, the batteries are the
main source of power. Correct Answers TRUE
127. When in emergency mode, which busses automatically
disconnect from the batteries? Correct Answers Main Bus
128. What is the voltage output of the AC generators? Correct
Answers 115 V
129. Where are the AC generators mounted on the aircraft?
Correct Answers Propeller reduction gearbox
130. How many external AC power ports are there on the
aircraft? Correct Answers 1
131. When the aircraft is powered by external DC power, which
busses are powered? Correct Answers L/R main feeder buses,
Essential Buses, and feeder busses
132. True or False: When a DC generator fails, the Main Bus
Tie switch must be manually selected. Correct Answers
133. Which switch would pilots use to connect the main battery
to the associated feeder bus? Correct Answers Main Battery
switch in the DC control Panel
